Use SPDX license headers

Use simple SPDX license strings instead of having paragraphs of text
about the license in the header of every single source file of the
project.

Signed-off-by: Paul Cercueil <[email protected]>

Author: pcercuei

backend.c

@@ -1,18 +1,9 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * libiio - Library for interfacing industrial I/O (IIO) devices
  *
  * Copyright (C) 2017 Analog Devices, Inc.
  * Author: Paul Cercueil <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
  */
 
 #include "iio-config.h"

bindings/csharp/Attr.cs

@@ -1,20 +1,10 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * libiio - Library for interfacing industrial I/O (IIO) devices
  *
  * Copyright (C) 2015 Analog Devices, Inc.
  * Author: Paul Cercueil <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * */
+ */
 
 using System;
 using System.Collections.Generic;

bindings/csharp/Channel.cs

@@ -1,20 +1,10 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * libiio - Library for interfacing industrial I/O (IIO) devices
  *
  * Copyright (C) 2015 Analog Devices, Inc.
  * Author: Paul Cercueil <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * */
+ */
 
 using System;
 using System.Collections.Generic;

bindings/csharp/Context.cs

@@ -1,20 +1,10 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * libiio - Library for interfacing industrial I/O (IIO) devices
  *
  * Copyright (C) 2015 Analog Devices, Inc.
  * Author: Paul Cercueil <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * */
+ */
 
 using System;
 using System.Collections.Generic;

bindings/csharp/Device.cs

@@ -1,20 +1,10 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * libiio - Library for interfacing industrial I/O (IIO) devices
  *
  * Copyright (C) 2015 Analog Devices, Inc.
  * Author: Paul Cercueil <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * */
+ */
 
 using System;
 using System.Collections.Generic;

bindings/csharp/IOBuffer.cs

@@ -1,20 +1,10 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * libiio - Library for interfacing industrial I/O (IIO) devices
  *
  * Copyright (C) 2015 Analog Devices, Inc.
  * Author: Paul Cercueil <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * */
+ */
 
 using System;
 using System.Collections.Generic;

bindings/csharp/IioLib.cs

@@ -1,20 +1,10 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * libiio - Library for interfacing industrial I/O (IIO) devices
  *
  * Copyright (C) 2020 Analog Devices, Inc.
  * Author: Paul Cristian Iacob <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * */
+ */
 
 using System;
 using System.Linq;

bindings/csharp/ScanContext.cs

@@ -1,20 +1,10 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * libiio - Library for interfacing industrial I/O (IIO) devices
  *
  * Copyright (C) 2020 Analog Devices, Inc.
  * Author: Cristian Iacob <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * */
+ */
 
 using System;
 using System.Collections.Generic;

bindings/csharp/Trigger.cs

@@ -1,20 +1,10 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
 /*
  * libiio - Library for interfacing industrial I/O (IIO) devices
  *
  * Copyright (C) 2015 Analog Devices, Inc.
  * Author: Paul Cercueil <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * */
+ */
 
 using System;
 using System.Collections.Generic;

bindings/python/iio.py

@@ -1,17 +1,10 @@
 #!/usr/bin/env python
+# SPDX-License-Identifier: LGPL-2.1-or-later
 """
+SPDX-License-Identifier: LGPL-2.1-or-later
+
 Copyright (C) 2014 Analog Devices, Inc.
 Author: Paul Cercueil <[email protected]>
-
-This library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Lesser General Public
-License as published by the Free Software Foundation; either
-version 2.1 of the License, or (at your option) any later version.
-
-This library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-Lesser General Public License for more details.
 """
 
 # Imports from package ctypes are not grouped